Utility heater



FIG. 1 is a perspective view of a utility heater, showing my new design;

FIG. 2 is a side elevational view, the opposite side being a mirror image thereof;

FIG. 3 is an end elevational view, the opposite end being a mirror image thereof; and

FIG. 4 is a bottom plan view thereof. 

The ornamental design for a utility heater, as shown. 